Steam-generator.



No. 659,217. Patented Oct. 9, 1960. e. nuns.

STEAMGENERATOB.

(Application flied Apr. 25, 1899.)

(No Model.)

MXM w NITED STATES PATENT GFFICTE.

GUSTAV DIIRR, OF DUSSELDORF, GERMANY.

STEAM-GENERATOR.

SPECIFICATION forming-part of Letters Patent No. 659,217, dated October 9, 190

' Application filed April 25, 1899. erial No. 714,356. (No model.)

To all whom it may concern:

Be it known that I, GUSTAV DllRR, a citizen of Germany, and a resident of Dusseldorf, Germany, haveinvented certain new and useful Improvements in Water-Tubes for Steam- Generators, of which the following is a specification.

This invention relates to tubular steam-generators with inclined Field tubes. Hitherto it has been customary to form near the lower or rear ends of such tubes a sudden contraction or sharp neck joining the narrow rear end with the wider main part of the said tubes, the consequence being that mud and boiler-scale was liable to settle in front of the said neck.

In order to avoid this defect, I adopt the shape represented by the accompanying drawings, in which- Figures 1 and 2 are sections through the rear ends of boilers, showing two embodiments of the invention.

1 render the transition from the wide part a to the narrow end I) gradual, so as to form a conoidal extremity c, the lowest part or sole of which is approximately horizontal or slightly inclined downward, so that the whole of the water contained in the tube a, which is set at an inclination to the boiler-wall, will flow out after the removal of the cap d. The cap ispreferably provided with an internal screw-thread, so as to form a nut adapted to be screwed onto the narrow rear end. A tight joint may be produced in any known manner.

I claim In a steam-generator, a Field tube set at an inclination to the boiler-Wall and having a rear end which is gradually reduced, and is set in an approximately-horizontal or slightlyinclined plane to prevent stagnation within the tube, combined with a cap adapted to close the narrow rear end of the tube, substantially as specified.

Signed by me, at Dusseldorf, Germany, this 4th day of April 1899.

GUSTAV DURR.

Witnesses:

WILLIAM ESSENWEIN, GEO. P. PETTIT. 

